import  pandas as pd
import numpy as np
a1=pd.Series([1,2,3,4,5])
print(a1)
arr1=np.array([1,2,3,4,5])
a2=pd.Series(arr1,['a','b','c','d','e'])
print(a2)
a3=pd.Series({'a':1,'b':2,'c':3,'d':4,'e':5})
print(a3)